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[1/4] vboxsf: Honor excl flag to the dir-inode create op

Message ID 20210121130317.146506-2-hdegoede@redhat.com (mailing list archive)
State New
Headers show
Series vboxsf: Add support for the atomic_open directory-inode op | expand

Commit Message

Hans de Goede Jan. 21, 2021, 1:03 p.m. UTC
Honor the excl flag to the dir-inode create op, instead of behaving
as if it is always set.

Note the old behavior still worked most of the time since a non-exclusive
open only calls the create op, if there is a race and the file is created
between the dentry lookup and the calling of the create call.

While at it change the type of the is_dir parameter to the
vboxsf_dir_create() helper from an int to a bool, to be consistent with
the use of bool for the excl parameter.

Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
 fs/vboxsf/dir.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)
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diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index 4d569f14a8d8..c3e68ad6c0f4 100644
--- a/fs/vboxsf/dir.c
+++ b/fs/vboxsf/dir.c
@@ -253,7 +253,7 @@  static int vboxsf_dir_instantiate(struct inode *parent, struct dentry *dentry,
 static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
-			     umode_t mode, int is_dir)
+			     umode_t mode, bool is_dir, bool excl)
 	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
 	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
@@ -261,10 +261,12 @@  static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
 	int err;
 	params.handle = SHFL_HANDLE_NIL;
-	params.create_flags = SHFL_CF_ACT_CREATE_IF_NEW |
-			      (is_dir ? SHFL_CF_DIRECTORY : 0);
+	if (is_dir)
+		params.create_flags |= SHFL_CF_DIRECTORY;
+	if (excl)
+		params.create_flags |= SHFL_CF_ACT_FAIL_IF_EXISTS;
 	params.info.attr.mode = (mode & 0777) |
 	params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
@@ -291,13 +293,13 @@  static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
 static int vboxsf_dir_mkfile(struct inode *parent, struct dentry *dentry,
 			     umode_t mode, bool excl)
-	return vboxsf_dir_create(parent, dentry, mode, 0);
+	return vboxsf_dir_create(parent, dentry, mode, false, excl);
 static int vboxsf_dir_mkdir(struct inode *parent, struct dentry *dentry,
 			    umode_t mode)
-	return vboxsf_dir_create(parent, dentry, mode, 1);
+	return vboxsf_dir_create(parent, dentry, mode, true, true);
 static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)